[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 55.487219][ T26] audit: type=1800 audit(1570203328.361:25): pid=8646 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 55.528069][ T26] audit: type=1800 audit(1570203328.361:26): pid=8646 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 55.569464][ T26] audit: type=1800 audit(1570203328.361:27): pid=8646 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.138' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 63.386717][ T8799] netlink: 'syz-executor235': attribute type 2 has an invalid length. [ 63.395134][ T8799] kasan: CONFIG_KASAN_INLINE enabled [ 63.400512][ T8799] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 63.408733][ T8799] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 63.415665][ T8799] CPU: 1 PID: 8799 Comm: syz-executor235 Not tainted 5.3.0+ #0 [ 63.423201][ T8799] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.433365][ T8799] RIP: 0010:dsmark_init+0x193/0x640 [ 63.438562][ T8799] Code: 85 db 58 0f 88 7d 03 00 00 e8 e9 1a ac fb 48 8b 9d 70 ff ff ff 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 04 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 ca [ 63.458330][ T8799] RSP: 0018:ffff88809426f3b8 EFLAGS: 00010247 [ 63.465241][ T8799] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff85c6eb09 [ 63.473278][ T8799] RDX: 0000000000000000 RSI: ffffffff85c6eb17 RDI: 0000000000000004 [ 63.481226][ T8799] RBP: ffff88809426f4b0 R08: ffff88808c4085c0 R09: ffffed1015d26159 [ 63.489184][ T8799] R10: ffffed1015d26158 R11: ffff8880ae930ac7 R12: ffff8880a7e96940 [ 63.497144][ T8799] R13: dffffc0000000000 R14: ffff88809426f8c0 R15: 0000000000000000 [ 63.505107][ T8799] FS: 0000000001292880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 63.514024][ T8799] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 63.520592][ T8799] CR2: 0000000020000080 CR3: 000000008ca1b000 CR4: 00000000001406e0 [ 63.528546][ T8799] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 63.536508][ T8799] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 63.544627][ T8799] Call Trace: [ 63.547912][ T8799] ? dsmark_dump_class+0x680/0x680 [ 63.553026][ T8799] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 63.559254][ T8799] ? lockdep_rtnl_is_held+0x26/0x30 [ 63.564442][ T8799] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 63.570663][ T8799] ? dsmark_dump_class+0x680/0x680 [ 63.575764][ T8799] qdisc_create+0x4ee/0x1210 [ 63.580352][ T8799] ? tc_get_qdisc+0xc10/0xc10 [ 63.585033][ T8799] ? __nla_parse+0x43/0x60 [ 63.589444][ T8799] tc_modify_qdisc+0x524/0x1c50 [ 63.594291][ T8799] ? qdisc_create+0x1210/0x1210 [ 63.599141][ T8799] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 63.605357][ T8799] ? qdisc_create+0x1210/0x1210 [ 63.610190][ T8799] rtnetlink_rcv_msg+0x463/0xb00 [ 63.615107][ T8799] ? rtnl_bridge_getlink+0x910/0x910 [ 63.620373][ T8799] ? lock_downgrade+0x920/0x920 [ 63.625199][ T8799] ? netlink_deliver_tap+0x22d/0xbf0 [ 63.630464][ T8799] ? find_held_lock+0x35/0x130 [ 63.635206][ T8799] netlink_rcv_skb+0x177/0x450 [ 63.639957][ T8799] ? rtnl_bridge_getlink+0x910/0x910 [ 63.645216][ T8799] ? netlink_ack+0xb50/0xb50 [ 63.649783][ T8799] ? __kasan_check_read+0x11/0x20 [ 63.654786][ T8799] ? netlink_deliver_tap+0x254/0xbf0 [ 63.660055][ T8799] rtnetlink_rcv+0x1d/0x30 [ 63.664448][ T8799] netlink_unicast+0x531/0x710 [ 63.669193][ T8799] ? netlink_attachskb+0x7c0/0x7c0 [ 63.674281][ T8799] ? _copy_from_iter_full+0x25d/0x8c0 [ 63.679650][ T8799] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 63.685347][ T8799] ? __check_object_size+0x3d/0x437 [ 63.690528][ T8799] netlink_sendmsg+0x8a5/0xd60 [ 63.695270][ T8799] ? netlink_unicast+0x710/0x710 [ 63.700183][ T8799] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 63.705702][ T8799] ? apparmor_socket_sendmsg+0x2a/0x30 [ 63.711165][ T8799] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 63.717384][ T8799] ? security_socket_sendmsg+0x8d/0xc0 [ 63.722820][ T8799] ? netlink_unicast+0x710/0x710 [ 63.727737][ T8799] sock_sendmsg+0xd7/0x130 [ 63.732135][ T8799] ___sys_sendmsg+0x803/0x920 [ 63.736788][ T8799] ? copy_msghdr_from_user+0x440/0x440 [ 63.742227][ T8799] ? __might_fault+0x12b/0x1e0 [ 63.748468][ T8799] ? find_held_lock+0x35/0x130 [ 63.753303][ T8799] ? lock_downgrade+0x920/0x920 [ 63.758137][ T8799] ? __kasan_check_read+0x11/0x20 [ 63.763447][ T8799] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 63.769671][ T8799] ? __fget_light+0x1a9/0x230 [ 63.774328][ T8799] ? __fdget+0x1b/0x20 [ 63.778387][ T8799] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 63.784606][ T8799] __sys_sendmsg+0x105/0x1d0 [ 63.789186][ T8799] ? __sys_sendmsg_sock+0xd0/0xd0 [ 63.794291][ T8799] ? trace_hardirqs_on_thunk+0x1a/0x20 [ 63.799735][ T8799] ? do_syscall_64+0x26/0x760 [ 63.804394][ T8799] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 63.810452][ T8799] ? do_syscall_64+0x26/0x760 [ 63.815211][ T8799] __x64_sys_sendmsg+0x78/0xb0 [ 63.819972][ T8799] do_syscall_64+0xfa/0x760 [ 63.824455][ T8799] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 63.830335][ T8799] RIP: 0033:0x440369 [ 63.834212][ T8799] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 63.853892][ T8799] RSP: 002b:00007fff33021f78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 63.862293][ T8799] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440369 [ 63.870424][ T8799] RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000000000003 [ 63.878387][ T8799] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 63.886358][ T8799] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401bf0 [ 63.894343][ T8799] R13: 0000000000401c80 R14: 0000000000000000 R15: 0000000000000000 [ 63.902300][ T8799] Modules linked in: [ 63.906918][ T8799] ---[ end trace aa01c3aa9b46f4fc ]--- [ 63.912494][ T8799] RIP: 0010:dsmark_init+0x193/0x640 [ 63.917724][ T8799] Code: 85 db 58 0f 88 7d 03 00 00 e8 e9 1a ac fb 48 8b 9d 70 ff ff ff 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 04 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 ca [ 63.937469][ T8799] RSP: 0018:ffff88809426f3b8 EFLAGS: 00010247 [ 63.943567][ T8799] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff85c6eb09 [ 63.951566][ T8799] RDX: 0000000000000000 RSI: ffffffff85c6eb17 RDI: 0000000000000004 [ 63.960029][ T8799] RBP: ffff88809426f4b0 R08: ffff88808c4085c0 R09: ffffed1015d26159 [ 63.968029][ T8799] R10: ffffed1015d26158 R11: ffff8880ae930ac7 R12: ffff8880a7e96940 [ 63.975996][ T8799] R13: dffffc0000000000 R14: ffff88809426f8c0 R15: 0000000000000000 [ 63.983995][ T8799] FS: 0000000001292880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 63.992961][ T8799] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 63.999582][ T8799] CR2: 0000000020000080 CR3: 000000008ca1b000 CR4: 00000000001406e0 [ 64.007563][ T8799] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 64.015581][ T8799] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 64.023828][ T8799] Kernel panic - not syncing: Fatal exception [ 64.031454][ T8799] Kernel Offset: disabled [ 64.035803][ T8799] Rebooting in 86400 seconds..